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Merge pull request #350 from mr-c/patch-1

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add/improve atomic yields for SSE2, ARM*, PowerPC
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Daan 2021-01-28 17:29:54 -08:00 • committed by GitHub
commit d9ae916a74
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1 changed files with 19 additions and 2 deletions
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21
include/mimalloc-atomic.h
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@ -281,16 +281,33 @@ static inline void mi_atomic_yield(void) {
static inline void mi_atomic_yield(void) { static inline void mi_atomic_yield(void) {
YieldProcessor(); YieldProcessor();
} }
#elif defined(__SSE2__)
#include <emmintrin.h>
static inline void mi_atomic_yield(void) {
_mm_pause();
}
#elif (defined(__GNUC__) || defined(__clang__)) && \ #elif (defined(__GNUC__) || defined(__clang__)) && \
(defined(__x86_64__) || defined(__i386__) || (defined(__arm__) && __ARM_ARCH__ >= 7) || defined(__aarch64__)) (defined(__x86_64__) || defined(__i386__) || (defined(__arm__) || defined(__armel__) || defined(__ARMEL__) || defined(__aarch64__) || defined(__powerpc__) || defined(__ppc__) || defined(__PPC__))
#if defined(__x86_64__) || defined(__i386__) #if defined(__x86_64__) || defined(__i386__)
static inline void mi_atomic_yield(void) { static inline void mi_atomic_yield(void) {
__asm__ volatile ("pause" ::: "memory"); __asm__ volatile ("pause" ::: "memory");
} }
#elif (defined(__arm__) && __ARM_ARCH__ >= 7) || defined(__aarch64__) #elif defined(__aarch64__)
static inline void mi_atomic_yield(void) {
asm volatile("wfe");
}
#elif (defined(__arm__) && __ARM_ARCH__ >= 7)
static inline void mi_atomic_yield(void) { static inline void mi_atomic_yield(void) {
__asm__ volatile("yield" ::: "memory"); __asm__ volatile("yield" ::: "memory");
} }
#elif defined(__powerpc__) || defined(__ppc__) || defined(__PPC__)
static inline void mi_atomic_yield(void) {
__asm__ __volatile__ ("or 27,27,27" ::: "memory");
}
#elif defined(__armel__) || defined(__ARMEL__)
static inline void mi_atomic_yield(void) {
asm volatile ("nop" ::: "memory");
}
#endif #endif
#elif defined(__sun) #elif defined(__sun)
// Fallback for other archs // Fallback for other archs